Grinding-mill



(No Model.) A3 Sheets-Sheet 1.

A. W. STRAUB.

GRINDING MILL.

(No. Model.) 3 Sheets-Sheet 2'.

' A. W. STRAUB.

GRINDING MILL.

No.'512,846. .Patented Jan. 16, 1894.

UNITED STATES PATENT AMBROSE WV. STRAUB, OF PHILADELPHIA, PENNSYLVANIA.

G'RlNDlNG-MILL.

SPECIFICATION forming part of Letters Patent No. 512,846, dated January16, 1894.

Application filed November 4. 1892. Serial No. 450,937. (No model.)

To all whom it may concern:

Be it known that I, AMBROSE W. STRAUB, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inGrinding- Mills, of which the following is a specification, referencebeing had therein to the accompanying drawings.

My invention has particular reference to grinding mills of the typeshown in the Letters Patent which were granted to nie on June 27, 1882,No. 260,062, and July14, 1835, No. 322,400, and has for its objects theiinprovement of the construction of various parts of the machine with aview to simplicity and economy and the production of amill which willact more efficiently in the reduction of the various substances uponwhich it is required to operate. These objects I accomplish by the useof the mechanism illustrated in the accompanying drawings andtheinvention consists in certain novel features of the saine which will behereinafter described and claimed.

In the drawings referred to, Figure 1 is a longitudinal section of amill constructed in accordance with iny invention. Fig. 2 lis atransverse section on the line sc-x of Fig. 1. Figs. 3 and 4 are detail`views of the bearing for the end of the shaft showing the same inperspective and vertical section respectively.

Fig. 5 is a transverse section on the line y-y of Fig. 1. Fig. 6 is anelevation of the trainining ring seat. Fig. 7 is an elevation of therocker disk or tramming ring. Fig. 8 is an elevation of the grindingdisk. Fig. 9 is a perspective View of the mill. Fig. 10 is an elevationof the disk which carries the rotating grinding ring and Figs. 11 and 12are detail views of the breaking drum with the drunken saws thereon.

Referring particularly to the drawings by letter, A designates thesupporting legs, forming a frame which may, if desired, be cast integralwith a casing B and the hopper C. At one end of the casing and hopper isan annular flange c which together with a covering cap CZ forms acircular chamber in which the grinding disks or rings are arranged.

Upon reference to Fig. 5 it will be noticed that the casing B is partlycircular in form so as to partially surround the breaking drum which isindicated in dotted lines and is eztpanded on one side to merge into theyertlcal rear face of the hopper, thus leaving a gradually narrowingspace between the drum and side of the casing in which the material iscrowded and reduced. The front side of the hopper is inclined as shownin said gure so as to-throw the material over toward sys the graduallynarrowing space and prevent it from being lifted by the teeth of thedrum saws on their upward movement. The rear kside of the hopper isperpendicular to pre-` vent cob bridging.

The driving shaft D extends longitudinally' y throughthe casing and ismounted in a suitable bearing upon one of the'legs A and in ajournal-box p formed on the outer face of the cap cl, the free end ofthe driving shaft being provided with a band pulley P by which motion isimparted to said shaft and a ily-wheel P to cause said motion to besteady and even. Within the casing the driving shaft carries a breakingdrum M which is provided with a series of saws f which extend the entirelength of the drum and have the teeth j" f2 formed in alternate serieson their front and rear faces, thereby providing a series of drunkensaws the entire length of said drum. At various points of the drum Ythedrunken saws are connected by' longitudinally disposed ribs g whichcoact with longitudinal recesses or groovesh ln the casing to break thematerial fed into the inachine into fine pieces which may be moreconveniently acted upon by the grinding disks or rings. It will benoticed that the drunken saws make a shear cut on the material as itlodges in the space between the drum andthe side of the casing and thus.break the saine into small pieces while the teeth on the front and rearfaces of the saws will further act on the same to break it into lineparticles, the ribs g completing the work thus inaugurated by the saidteeth.

In order to reduce the shocks on thebreakof the casing, I arrangebetween the said drum and the driving shaft a collar o of lead or othersimilar material which also aids in holding the said drum to the drivingshaft.

IOO

At the end of the casing and within the iiange c, I arrange a traminingring seat or disk Iwliich is provided on its rear face with a projection'i adapted to fit within a similarly shaped opening z" so that the diskor ring is prevented from turning. The central opening or eye of thetrainming ring seat or disk is equal in diameter to the outlet openingin the casing B so that the broken material may readily pass through thesaid ring to the grinding disks, and the said eye or central opening 7cis surrounded by an annular convex rib It' as shown most clearly in Fig.l. A rocker or tramming disk L [its Within the recessed face of the tramming ring seat and is provided with a central opening or eye Z and anannular rib Z `which has a circular face i'esting against the rib 7.a topermit the disk L to rock when Vnecessary so as to .tram to the runningdisk and allow a foreign substance to pass out. The rocker disk isprevented from rotating by means of the recesses Z2 in its peripherywhich engage the lugs 7a2 on the tramming ring seat or disk While thesaid tramming ring seat or disk is provided with a flange I2 to preventthe entrance behind the traniining or rocker disks of any of thematerial upon which the mill may be acting.

The stationary grinding disk or ring E is secured to the rocker disk orring, as clearly shown in Fig. l, and its face presente the peculiardress illustrated in Fig. 8. The disks are provided with a centralopening or eye to permit the passage of the material to be ground andaround said eye are provided With a series of teeth c7 to cut up thesevered parts of cobs of corn into still liner particles, and a seriesof conveyer-Iiiglits es placed tangentially to the eye of the disk sothat the material fed to the disk is conveyed or caused to move acrossthe face of the disk. The disk is further provided with a series offurrows e5 which are arranged somewhat tangentially to the eye and havetheir cutting edges in front While beyond the said fui-rows e5 arearranged the more nearly radial furrows e which have their sharp edgesin the rear so that their front faces are inclined and form crushingsides. The two grinding disks are of the saine construction and theresult of this peculiar dress is that when the disks are in operationthe material is rst cut up by the teeth eri and then moved over thefaces of the disks by the iiights e8. The material is thus forced overthe furroivs e5 by Which it is cut into finer particles and afterwardmoved over the furrows eG Where it is crushed, rolled or mashed so as tobe reduced to flour that is not standard to the touch but is soft andmellow.

The running grinding disk is secured to a disk N which is mounted on thedriving shaft and is secured thereto so as to be rotated by means of asuitable key. The hub n of said disk is provided with recesses n Whichare engaged by projections n2 which are formed on the end of thebreaking drum so that the said drinn Will be rotated with the said diskN.

The grinding disks employed by ine have been found to produce the bestpossible grinding action but also create considerable friction and thusgive a very strong end thru/st to the driving shaft and in order toovercome, as far as possible, the said end thrust I pro vide ananti-friction bearing at the end of the shaft which is fully shown inFigs. 1, 2, 3 and 4. It will be noticed that the end of thedriving shaftenters a journal-box p which is formed on the cap tl and there bearsagainst a disk q, the rear face of which is provided with an annulargroove r. In rea-r of the disk q is a disk Q which also has an annulargroove registering with the annulargroove v; and is further providedwith a projection s which enters the narrow, upper portion of thejournal-box p, as shown in Fig. 2. v l are held together by a centralpivot pin Q and are separated by the series of balls s arranged withinthe annular grooves in the adjacent faces tliereof which form ananti-friction bearing to reduce and relieve the friction due to the endthrust of the driving shaft. The said balls are preferably ofalternately large and small diameters so that the intei'- mediate ballsmay reverse and turn in opposite directions. The upper portion of tliejournal boX p is sufficiently long to permit the longitudinal adjustmentof the driving shaft which adjustment is provided tor by means of alever or arm T which is pivotcd to a lug t on the end of the journal-boxand through which passes a set screW 'l which bears against the disk Qand is provided with a lock-nut t. In order that the driving shaft mayhave a longitudinal movement when any hard substance finds its way tothe grinding rings I provide the spring V one end of which is secured tothe lower end of the arm or lever T and the opposite end of which is.secured to the base or some other fixed portion of the machine.

No provision for keeping the disks separate When the mill is runningempty is necessary, as the furrows and ridges at the outer edges of thedisks are flat so as to pass each other Without clashing or becomingdull.

In practice, the material to be acted o n which is usually corn-cobs ands hell corn is placed inthe hopper and motion imparted to the drivingshaft. The material in the hopper Will rest upon the breaking drum andin the space between the same and the side of the casing so that as thesaid drum revolves the material will be broken up and cut into fineparticles and fed toward the grinding rings or disks. The material isthen thoroughly reduced by the grinding rings or disks and then passesthrough any of the discharge openings into suitable receptacles. It Willbe noticed that by the peculiar formation of the casing and hopperclogging of the breaking drum is prevented as the inclined side of thehopper causes the material to slide over thc The two disks IOO IIO

drum and into the space between the same and the casing so that it isimpossible for the corn-cobs to become lodged overthe drum and form abridge to preventA the material in the hopper passing to the drum owingto the op- .posite side of the hopper being perpendicular. By provdingthe teeth f f2 alternately on opposite sides of the saw f, l insure thecutting away of both ends of' the small sections into which the corncobs are cut by the outer edge teeth oi' the saw and at the same time Ido not unnecessarily redncethe material in the saw and. impair thestrength of the same. Having thus described my invention, what I claim,and desire to lsecure by Letters Patent, is i l. A breaking drum forgrinding mills consisting of a central sleeve having a helical sawprovided on its opposite faces with alternating series of teeth.

2. In a grinding mill, the combination of the casing having longitudinalgrooves, a drum arranged in said casing and provided with a helical sawhaving alternate series of teeth on its opposite facings, andlongitudinal breaking ribs connecting adjacent coils of said saw.

3. The combination of the casing having an annular flange and a recessin its end, a trarnming ring seat fitting within the flange and having aprojection on its rear side engaging the recess, a tramming ring fittedon said seat, a grinding disk secured to said ring, a running grindingdisk, and a driving shaft.y

4. The combination of the casing, the trannming ring seat secured totheend of the saine and having the annular shield I2 and the annular convexrib lo', and the tramming ring seat fitting within the shield Iz'andhaving ay convex rib Z engaging the rib la.

In testimony whereof Iaffix my signature in 4o the presencejof twowitnesses.

AMBROSE W. STRAUB.

Witnesses:

ALEX.- D. LAUER, WALTER W. OALMORE.

